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421509-en-GB_v2.6   8/16 

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HOLD Mode (Main Display only) 

Press the HOLD button to enter the Data Hold mode, the "HOLD" annunciator will display. When 
HOLD is selected, the thermometer freezes the reading on the main display only. Press the HOLD 
button again to return to the normal measurement mode. 

MIN/MAX with Time Record Mode (Main Display only) 

Note: Auto Power OFF and several keys (Power, C/F, REL, SET, HI/LO, TYPE, and T1, T2, T1-T2) 
are defeated in this mode 
 
Press MIN MAX to enter the MIN/MAX recording mode; the meter will begin keeping track of the 
highest (MAX), lowest (MIN), MAX-MIN, and Average (AVG) readings. There are four displays 
(listed below) for this mode. Use the MIN MAX key to scroll through all four. 

1. 

When the “REC” icon is on the display (top), the meter is displaying measurements normally 
while it is recording. 

2. 

With the “REC MAX” icon on the display, the meter continues taking measurements but the 
main display shows only the highest (MAX) reading recorded. The Elapsed Time (in hours, 
minutes, and seconds) is shown in the lower right LCD field. The Timer shows when the MAX 
reading was taken. 

3. 

With the “REC MIN” icon on the display, the main display shows only the lowest reading 
recorded. The Time of the MIN reading is shown in the lower right LCD field. 

4. 

With the “REC MAX-MIN” icon on the display, the main display shows the difference between 
Max and Min.  

5. 

With the “REC AVG” icon on the display, the main display shows only the average of all the 
readings recorded. Note that the averaging limit is 22 hours. After 22 hours, the last average 
reading display is held on the LCD. 

 
The meter emits a tone when a new minimum or maximum value is recorded. Use the HOLD button 
to pause recording (all values are then held). Press HOLD again to resume recording. To exit the 
MIN MAX mode press and hold the MIN MAX button for more than 2 seconds until the “REC” icon 
switches off.  

T1/T2 Button (Main Display) 

Press this button to select which thermocouple input configuration is represented on the main 
display; ‘T1’ will display for thermocouple input 1 or ‘T2’ for thermocouple 2. When the meter is 
turned on, it is set to the display that was in use when the meter was last powered off. 

T1/T2  (Second Display) 

Press this button to select which input is shown on the secondary display (lower left display); T1 for 
thermocouple 1 or T2 for thermocouple 2. When the meter is turned on, it is set to the display that 
was in use when the meter was last powered off. 

T1-T2/Time (Third Display) 

Press this button to select system time, date, or the differential between the two thermocouples (T1-
T2) for the third display (lower right display). When the meter is turned on, it is set to the display that 
was in use when the meter was last powered off. 

 

Содержание 421509

Страница 1: ...imum data capacity Backlit LCD Display T1 T2 T1 T2 displays MIN MAX AVG Record Recall Selectable temperature units C F Data Hold Relative Mode Elapsed Timer PC Interface ESC 0 ENTER 1 2 3 4 5 6 7 8 9 DISPLAY C F Limits LOG READ TYPE T1 T2 REL HOLD SHIFT OFS CLR SET SAVE READ TIME T1 T2 APO MAX MIN INVT TYPE T1 T2 MAIN SECOND THIRD 421509 T1 F T1 T2 K APO F T1 ...

Страница 2: ... device WARNING To avoid electrical shock do not use this instrument when working near voltages over 24V AC DC WARNING To avoid damage or burns do not make temperature measurement in microwave ovens CAUTION Repeated flexing can break the thermocouple leads To prolong lead life avoid sharp bends in the leads especially near the connector This symbol on the instrument indicates that the operator mus...

Страница 3: ...ith the Save function in the Shift Mode 1 Press the SAVE READ button to activate the read data function The word READ will be displayed on the LCD 2 Press the SECOND button until the sign is displayed in the bottom left display The location of the read pointer within the saved data table will be displayed 3 Press the 3 or 6 button to display the next data location Press the 2 or 5 button to increm...

Страница 4: ...With the REC MAX MIN icon on the display the main display shows the difference between Max and Min 5 With the REC AVG icon on the display the main display shows only the average of all the readings recorded Note that the averaging limit is 22 hours After 22 hours the last average reading display is held on the LCD The meter emits a tone when a new minimum or maximum value is recorded Use the HOLD ...

Страница 5: ...ed in one log session Press the LOG button again to exit the data log function CLR Button The CLR function clears all the saved and logged data in memory When the CLR button is pressed MEM is displayed and CLR flashes on the upper right of the LCD Press the overlay ENTER button to clear all saved and logged data or the ESC button to exit the function REL Button Press the REL key to enter the Relat...

Страница 6: ...ress the number buttons printed in white on the overlay to set Hi and Lo limit values The button same as the ESC overlay can be used to set a negative value Setting is from left to right digit Press the ENTER button to confirm each setting Mini DIN Hi Lo Alarm Output The alarm output jack refer to Figure 1 located on the top of the meter can be used to power external warning or switching devices w...

Страница 7: ...ain display will blink showing the previous setting Press the number buttons printed in white on the overlay to change the offset The resolution is 0 1 Use the button to set a negative value Press the ENTER button to confirm MAX 1999 9 C F System Time Setting To set or change the system time press the TIME button in Setup Mode The time and date in the bottom right display will blink Enter from lef...

Страница 8: ...red as text files on a PC The data files can then be exported to spreadsheet or other programs for further manipulation graphing sorting filing etc Connecting the Meter to a PC Connect the Optical Interface connector to the 421509 Thermometer The IR2 label should be facing up Connect the USB connector to the PC COM port 1 16 PC Requirements Note Please visit the www extech com website for the late...

Страница 9: ...o F 0 1o C 1o F 2000 J type 346 to 2192o F 210 to 1200o C 0 1o F 0 1o C 1o F 2000 T type 328 to 752o F 200 to 400o C 0 1o F 0 1o C E type 346 to 1832o F 210 to 1000o C 0 1o F 0 1o C R type 32 to 3212o F 0 to 1767o C 1o F 1o C S type 32 to 3212o F 0 to 1767o C 1o F 1o C N type 58 to 2372o F 50 to 1300o C 0 1o F 0 1o C Accuracy Specifications Thermocouple Accuracy K J T E types 0 05 rdg 0 6o F 58o F...

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